ha, you are exactly right sir in your assumption. i only bought one because in another listing they specifically say "10 cm from bolt to bolt".....and yes expensive, but i had a bunch of ebay dollars saved up (about 20 something) so it wasn't nearly as expensive.
i DIDN"T want to buy from them, because i did notice they were located in France, also because i emailed them a number of times asking about BCDs on other chainrings without any sort of answer for days.

BUT after searching a bunch on ebay and elsewhere, it seemed to be my only option for a 3 bolt 116 BCD chainring.

basically i want my girlfriend's bike to have an optimal gear ratio. the double chainring that came on the crankset was 40 teeth and 50, and with a 16 t and 18 t coaster brake cog none of the gear ratios seemed appropriate....40t /16t would still be a little low, plus the skid patches (its a coaster brake bike and im sure she is going to be skidding here and there) are only 2 on that ratio. 50t/18t has 9 skid patches but seemed a little high. 46t/18t is i think a good ratio for her, so the 46t chainring i think will work out well. i guess i was previously looking for 42t-44t chainrings, but in retrospect i think that might be too low. i dont want it to be tough for her, but i also want her to be able to keep up with me.....